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   1 /* linux/arch/arm/plat-s3c24xx/irq.c
   2  *
   3  * Copyright (c) 2003,2004 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/ioport.h>
  25 #include <linux/sysdev.h>
  26
  27 #include <asm/irq.h>
  28 #include <asm/mach/irq.h>
  29
  30 #include <plat/regs-irqtype.h>
  31
  32 #include <plat/cpu.h>
  33 #include <plat/pm.h>
  34 #include <plat/irq.h>
  35
  36 static void
  37 s3c_irq_mask(unsigned int irqno)
  38 {
  39         unsigned long mask;
  40
  41         irqno -= IRQ_EINT0;
  42
  43         mask = __raw_readl(S3C2410_INTMSK);
  44         mask |= 1UL << irqno;
  45         __raw_writel(mask, S3C2410_INTMSK);
  46 }
  47
  48 static inline void
  49 s3c_irq_ack(unsigned int irqno)
  50 {
  51         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  52
  53         __raw_writel(bitval, S3C2410_SRCPND);
  54         __raw_writel(bitval, S3C2410_INTPND);
  55 }
  56
  57 static inline void
  58 s3c_irq_maskack(unsigned int irqno)
  59 {
  60         unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
  61         unsigned long mask;
  62
  63         mask = __raw_readl(S3C2410_INTMSK);
  64         __raw_writel(mask|bitval, S3C2410_INTMSK);
  65
  66         __raw_writel(bitval, S3C2410_SRCPND);
  67         __raw_writel(bitval, S3C2410_INTPND);
  68 }
  69
  70
  71 static void
  72 s3c_irq_unmask(unsigned int irqno)
  73 {
  74         unsigned long mask;
  75
  76         if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
  77                 irqdbf2("s3c_irq_unmask %d\n", irqno);
  78
  79         irqno -= IRQ_EINT0;
  80
  81         mask = __raw_readl(S3C2410_INTMSK);
  82         mask &= ~(1UL << irqno);
  83         __raw_writel(mask, S3C2410_INTMSK);
  84 }
  85
  86 struct irq_chip s3c_irq_level_chip = {
  87         .name           = "s3c-level",
  88         .ack            = s3c_irq_maskack,
  89         .mask           = s3c_irq_mask,
  90         .unmask         = s3c_irq_unmask,
  91         .set_wake       = s3c_irq_wake
  92 };
  93
  94 struct irq_chip s3c_irq_chip = {
  95         .name           = "s3c",
  96         .ack            = s3c_irq_ack,
  97         .mask           = s3c_irq_mask,
  98         .unmask         = s3c_irq_unmask,
  99         .set_wake       = s3c_irq_wake
 100 };
 101
 102 static void
 103 s3c_irqext_mask(unsigned int irqno)
 104 {
 105         unsigned long mask;
 106
 107         irqno -= EXTINT_OFF;
 108
 109         mask = __raw_readl(S3C24XX_EINTMASK);
 110         mask |= ( 1UL << irqno);
 111         __raw_writel(mask, S3C24XX_EINTMASK);
 112 }
 113
 114 static void
 115 s3c_irqext_ack(unsigned int irqno)
 116 {
 117         unsigned long req;
 118         unsigned long bit;
 119         unsigned long mask;
 120
 121         bit = 1UL << (irqno - EXTINT_OFF);
 122
 123         mask = __raw_readl(S3C24XX_EINTMASK);
 124
 125         __raw_writel(bit, S3C24XX_EINTPEND);
 126
 127         req = __raw_readl(S3C24XX_EINTPEND);
 128         req &= ~mask;
 129
 130         /* not sure if we should be acking the parent irq... */
 131
 132         if (irqno <= IRQ_EINT7 ) {
 133                 if ((req & 0xf0) == 0)
 134                         s3c_irq_ack(IRQ_EINT4t7);
 135         } else {
 136                 if ((req >> 8) == 0)
 137                         s3c_irq_ack(IRQ_EINT8t23);
 138         }
 139 }
 140
 141 static void
 142 s3c_irqext_unmask(unsigned int irqno)
 143 {
 144         unsigned long mask;
 145
 146         irqno -= EXTINT_OFF;
 147
 148         mask = __raw_readl(S3C24XX_EINTMASK);
 149         mask &= ~( 1UL << irqno);
 150         __raw_writel(mask, S3C24XX_EINTMASK);
 151 }
 152
 153 int
 154 s3c_irqext_type(unsigned int irq, unsigned int type)
 155 {
 156         void __iomem *extint_reg;
 157         void __iomem *gpcon_reg;
 158         unsigned long gpcon_offset, extint_offset;
 159         unsigned long newvalue = 0, value;
 160
 161         if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
 162         {
 163                 gpcon_reg = S3C2410_GPFCON;
 164                 extint_reg = S3C24XX_EXTINT0;
 165                 gpcon_offset = (irq - IRQ_EINT0) * 2;
 166                 extint_offset = (irq - IRQ_EINT0) * 4;
 167         }
 168         else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
 169         {
 170                 gpcon_reg = S3C2410_GPFCON;
 171                 extint_reg = S3C24XX_EXTINT0;
 172                 gpcon_offset = (irq - (EXTINT_OFF)) * 2;
 173                 extint_offset = (irq - (EXTINT_OFF)) * 4;
 174         }
 175         else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
 176         {
 177                 gpcon_reg = S3C2410_GPGCON;
 178                 extint_reg = S3C24XX_EXTINT1;
 179                 gpcon_offset = (irq - IRQ_EINT8) * 2;
 180                 extint_offset = (irq - IRQ_EINT8) * 4;
 181         }
 182         else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
 183         {
 184                 gpcon_reg = S3C2410_GPGCON;
 185                 extint_reg = S3C24XX_EXTINT2;
 186                 gpcon_offset = (irq - IRQ_EINT8) * 2;
 187                 extint_offset = (irq - IRQ_EINT16) * 4;
 188         } else
 189                 return -1;
 190
 191         /* Set the GPIO to external interrupt mode */
 192         value = __raw_readl(gpcon_reg);
 193         value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
 194         __raw_writel(value, gpcon_reg);
 195
 196         /* Set the external interrupt to pointed trigger type */
 197         switch (type)
 198         {
 199                 case IRQ_TYPE_NONE:
 200                         printk(KERN_WARNING "No edge setting!\n");
 201                         break;
 202
 203                 case IRQ_TYPE_EDGE_RISING:
 204                         newvalue = S3C2410_EXTINT_RISEEDGE;
 205                         break;
 206
 207                 case IRQ_TYPE_EDGE_FALLING:
 208                         newvalue = S3C2410_EXTINT_FALLEDGE;
 209                         break;
 210
 211                 case IRQ_TYPE_EDGE_BOTH:
 212                         newvalue = S3C2410_EXTINT_BOTHEDGE;
 213                         break;
 214
 215                 case IRQ_TYPE_LEVEL_LOW:
 216                         newvalue = S3C2410_EXTINT_LOWLEV;
 217                         break;
 218
 219                 case IRQ_TYPE_LEVEL_HIGH:
 220                         newvalue = S3C2410_EXTINT_HILEV;
 221                         break;
 222
 223                 default:
 224                         printk(KERN_ERR "No such irq type %d", type);
 225                         return -1;
 226         }
 227
 228         value = __raw_readl(extint_reg);
 229         value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
 230         __raw_writel(value, extint_reg);
 231
 232         return 0;
 233 }
 234
 235 static struct irq_chip s3c_irqext_chip = {
 236         .name           = "s3c-ext",
 237         .mask           = s3c_irqext_mask,
 238         .unmask         = s3c_irqext_unmask,
 239         .ack            = s3c_irqext_ack,
 240         .set_type       = s3c_irqext_type,
 241         .set_wake       = s3c_irqext_wake
 242 };
 243
 244 static struct irq_chip s3c_irq_eint0t4 = {
 245         .name           = "s3c-ext0",
 246         .ack            = s3c_irq_ack,
 247         .mask           = s3c_irq_mask,
 248         .unmask         = s3c_irq_unmask,
 249         .set_wake       = s3c_irq_wake,
 250         .set_type       = s3c_irqext_type,
 251 };
 252
 253 /* mask values for the parent registers for each of the interrupt types */
 254
 255 #define INTMSK_UART0     (1UL << (IRQ_UART0 - IRQ_EINT0))
 256 #define INTMSK_UART1     (1UL << (IRQ_UART1 - IRQ_EINT0))
 257 #define INTMSK_UART2     (1UL << (IRQ_UART2 - IRQ_EINT0))
 258 #define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
 259
 260
 261 /* UART0 */
 262
 263 static void
 264 s3c_irq_uart0_mask(unsigned int irqno)
 265 {
 266         s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
 267 }
 268
 269 static void
 270 s3c_irq_uart0_unmask(unsigned int irqno)
 271 {
 272         s3c_irqsub_unmask(irqno, INTMSK_UART0);
 273 }
 274
 275 static void
 276 s3c_irq_uart0_ack(unsigned int irqno)
 277 {
 278         s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
 279 }
 280
 281 static struct irq_chip s3c_irq_uart0 = {
 282         .name           = "s3c-uart0",
 283         .mask           = s3c_irq_uart0_mask,
 284         .unmask         = s3c_irq_uart0_unmask,
 285         .ack            = s3c_irq_uart0_ack,
 286 };
 287
 288 /* UART1 */
 289
 290 static void
 291 s3c_irq_uart1_mask(unsigned int irqno)
 292 {
 293         s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
 294 }
 295
 296 static void
 297 s3c_irq_uart1_unmask(unsigned int irqno)
 298 {
 299         s3c_irqsub_unmask(irqno, INTMSK_UART1);
 300 }
 301
 302 static void
 303 s3c_irq_uart1_ack(unsigned int irqno)
 304 {
 305         s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
 306 }
 307
 308 static struct irq_chip s3c_irq_uart1 = {
 309         .name           = "s3c-uart1",
 310         .mask           = s3c_irq_uart1_mask,
 311         .unmask         = s3c_irq_uart1_unmask,
 312         .ack            = s3c_irq_uart1_ack,
 313 };
 314
 315 /* UART2 */
 316
 317 static void
 318 s3c_irq_uart2_mask(unsigned int irqno)
 319 {
 320         s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
 321 }
 322
 323 static void
 324 s3c_irq_uart2_unmask(unsigned int irqno)
 325 {
 326         s3c_irqsub_unmask(irqno, INTMSK_UART2);
 327 }
 328
 329 static void
 330 s3c_irq_uart2_ack(unsigned int irqno)
 331 {
 332         s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
 333 }
 334
 335 static struct irq_chip s3c_irq_uart2 = {
 336         .name           = "s3c-uart2",
 337         .mask           = s3c_irq_uart2_mask,
 338         .unmask         = s3c_irq_uart2_unmask,
 339         .ack            = s3c_irq_uart2_ack,
 340 };
 341
 342 /* ADC and Touchscreen */
 343
 344 static void
 345 s3c_irq_adc_mask(unsigned int irqno)
 346 {
 347         s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
 348 }
 349
 350 static void
 351 s3c_irq_adc_unmask(unsigned int irqno)
 352 {
 353         s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
 354 }
 355
 356 static void
 357 s3c_irq_adc_ack(unsigned int irqno)
 358 {
 359         s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
 360 }
 361
 362 static struct irq_chip s3c_irq_adc = {
 363         .name           = "s3c-adc",
 364         .mask           = s3c_irq_adc_mask,
 365         .unmask         = s3c_irq_adc_unmask,
 366         .ack            = s3c_irq_adc_ack,
 367 };
 368
 369 /* irq demux for adc */
 370 static void s3c_irq_demux_adc(unsigned int irq,
 371                               struct irq_desc *desc)
 372 {
 373         unsigned int subsrc, submsk;
 374         unsigned int offset = 9;
 375
 376         /* read the current pending interrupts, and the mask
 377          * for what it is available */
 378
 379         subsrc = __raw_readl(S3C2410_SUBSRCPND);
 380         submsk = __raw_readl(S3C2410_INTSUBMSK);
 381
 382         subsrc &= ~submsk;
 383         subsrc >>= offset;
 384         subsrc &= 3;
 385
 386         if (subsrc != 0) {
 387                 if (subsrc & 1) {
 388                         generic_handle_irq(IRQ_TC);
 389                 }
 390                 if (subsrc & 2) {
 391                         generic_handle_irq(IRQ_ADC);
 392                 }
 393         }
 394 }
 395
 396 static void s3c_irq_demux_uart(unsigned int start)
 397 {
 398         unsigned int subsrc, submsk;
 399         unsigned int offset = start - IRQ_S3CUART_RX0;
 400
 401         /* read the current pending interrupts, and the mask
 402          * for what it is available */
 403
 404         subsrc = __raw_readl(S3C2410_SUBSRCPND);
 405         submsk = __raw_readl(S3C2410_INTSUBMSK);
 406
 407         irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
 408                 start, offset, subsrc, submsk);
 409
 410         subsrc &= ~submsk;
 411         subsrc >>= offset;
 412         subsrc &= 7;
 413
 414         if (subsrc != 0) {
 415                 if (subsrc & 1)
 416                         generic_handle_irq(start);
 417
 418                 if (subsrc & 2)
 419                         generic_handle_irq(start+1);
 420
 421                 if (subsrc & 4)
 422                         generic_handle_irq(start+2);
 423         }
 424 }
 425
 426 /* uart demux entry points */
 427
 428 static void
 429 s3c_irq_demux_uart0(unsigned int irq,
 430                     struct irq_desc *desc)
 431 {
 432         irq = irq;
 433         s3c_irq_demux_uart(IRQ_S3CUART_RX0);
 434 }
 435
 436 static void
 437 s3c_irq_demux_uart1(unsigned int irq,
 438                     struct irq_desc *desc)
 439 {
 440         irq = irq;
 441         s3c_irq_demux_uart(IRQ_S3CUART_RX1);
 442 }
 443
 444 static void
 445 s3c_irq_demux_uart2(unsigned int irq,
 446                     struct irq_desc *desc)
 447 {
 448         irq = irq;
 449         s3c_irq_demux_uart(IRQ_S3CUART_RX2);
 450 }
 451
 452 static void
 453 s3c_irq_demux_extint8(unsigned int irq,
 454                       struct irq_desc *desc)
 455 {
 456         unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
 457         unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
 458
 459         eintpnd &= ~eintmsk;
 460         eintpnd &= ~0xff;       /* ignore lower irqs */
 461
 462         /* we may as well handle all the pending IRQs here */
 463
 464         while (eintpnd) {
 465                 irq = __ffs(eintpnd);
 466                 eintpnd &= ~(1<<irq);
 467
 468                 irq += (IRQ_EINT4 - 4);
 469                 generic_handle_irq(irq);
 470         }
 471
 472 }
 473
 474 static void
 475 s3c_irq_demux_extint4t7(unsigned int irq,
 476                         struct irq_desc *desc)
 477 {
 478         unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
 479         unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
 480
 481         eintpnd &= ~eintmsk;
 482         eintpnd &= 0xff;        /* only lower irqs */
 483
 484         /* we may as well handle all the pending IRQs here */
 485
 486         while (eintpnd) {
 487                 irq = __ffs(eintpnd);
 488                 eintpnd &= ~(1<<irq);
 489
 490                 irq += (IRQ_EINT4 - 4);
 491
 492                 generic_handle_irq(irq);
 493         }
 494 }
 495
 496 /* s3c24xx_init_irq
 497  *
 498  * Initialise S3C2410 IRQ system
 499 */
 500
 501 void __init s3c24xx_init_irq(void)
 502 {
 503         unsigned long pend;
 504         unsigned long last;
 505         int irqno;
 506         int i;
 507
 508         irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
 509
 510         /* first, clear all interrupts pending... */
 511
 512         last = 0;
 513         for (i = 0; i < 4; i++) {
 514                 pend = __raw_readl(S3C24XX_EINTPEND);
 515
 516                 if (pend == 0 || pend == last)
 517                         break;
 518
 519                 __raw_writel(pend, S3C24XX_EINTPEND);
 520                 printk("irq: clearing pending ext status %08x\n", (int)pend);
 521                 last = pend;
 522         }
 523
 524         last = 0;
 525         for (i = 0; i < 4; i++) {
 526                 pend = __raw_readl(S3C2410_INTPND);
 527
 528                 if (pend == 0 || pend == last)
 529                         break;
 530
 531                 __raw_writel(pend, S3C2410_SRCPND);
 532                 __raw_writel(pend, S3C2410_INTPND);
 533                 printk("irq: clearing pending status %08x\n", (int)pend);
 534                 last = pend;
 535         }
 536
 537         last = 0;
 538         for (i = 0; i < 4; i++) {
 539                 pend = __raw_readl(S3C2410_SUBSRCPND);
 540
 541                 if (pend == 0 || pend == last)
 542                         break;
 543
 544                 printk("irq: clearing subpending status %08x\n", (int)pend);
 545                 __raw_writel(pend, S3C2410_SUBSRCPND);
 546                 last = pend;
 547         }
 548
 549         /* register the main interrupts */
 550
 551         irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
 552
 553         for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) {
 554                 /* set all the s3c2410 internal irqs */
 555
 556                 switch (irqno) {
 557                         /* deal with the special IRQs (cascaded) */
 558
 559                 case IRQ_EINT4t7:
 560                 case IRQ_EINT8t23:
 561                 case IRQ_UART0:
 562                 case IRQ_UART1:
 563                 case IRQ_UART2:
 564                 case IRQ_ADCPARENT:
 565                         set_irq_chip(irqno, &s3c_irq_level_chip);
 566                         set_irq_handler(irqno, handle_level_irq);
 567                         break;
 568
 569                 case IRQ_RESERVED6:
 570                 case IRQ_RESERVED24:
 571                         /* no IRQ here */
 572                         break;
 573
 574                 default:
 575                         //irqdbf("registering irq %d (s3c irq)\n", irqno);
 576                         set_irq_chip(irqno, &s3c_irq_chip);
 577                         set_irq_handler(irqno, handle_edge_irq);
 578                         set_irq_flags(irqno, IRQF_VALID);
 579                 }
 580         }
 581
 582         /* setup the cascade irq handlers */
 583
 584         set_irq_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7);
 585         set_irq_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8);
 586
 587         set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
 588         set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
 589         set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
 590         set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
 591
 592         /* external interrupts */
 593
 594         for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
 595                 irqdbf("registering irq %d (ext int)\n", irqno);
 596                 set_irq_chip(irqno, &s3c_irq_eint0t4);
 597                 set_irq_handler(irqno, handle_edge_irq);
 598                 set_irq_flags(irqno, IRQF_VALID);
 599         }
 600
 601         for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
 602                 irqdbf("registering irq %d (extended s3c irq)\n", irqno);
 603                 set_irq_chip(irqno, &s3c_irqext_chip);
 604                 set_irq_handler(irqno, handle_edge_irq);
 605                 set_irq_flags(irqno, IRQF_VALID);
 606         }
 607
 608         /* register the uart interrupts */
 609
 610         irqdbf("s3c2410: registering external interrupts\n");
 611
 612         for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
 613                 irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
 614                 set_irq_chip(irqno, &s3c_irq_uart0);
 615                 set_irq_handler(irqno, handle_level_irq);
 616                 set_irq_flags(irqno, IRQF_VALID);
 617         }
 618
 619         for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
 620                 irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
 621                 set_irq_chip(irqno, &s3c_irq_uart1);
 622                 set_irq_handler(irqno, handle_level_irq);
 623                 set_irq_flags(irqno, IRQF_VALID);
 624         }
 625
 626         for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
 627                 irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
 628                 set_irq_chip(irqno, &s3c_irq_uart2);
 629                 set_irq_handler(irqno, handle_level_irq);
 630                 set_irq_flags(irqno, IRQF_VALID);
 631         }
 632
 633         for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
 634                 irqdbf("registering irq %d (s3c adc irq)\n", irqno);
 635                 set_irq_chip(irqno, &s3c_irq_adc);
 636                 set_irq_handler(irqno, handle_edge_irq);
 637                 set_irq_flags(irqno, IRQF_VALID);
 638         }
 639
 640         irqdbf("s3c2410: registered interrupt handlers\n");
 641 }